Means for locking nuts to bolts.



'PATBNTED JULY 9, 1907.

A. T. HUGHES.

MEANS FOR LOCKING NUTS TO BOLTS.

APPLICATION FILED APR.1,1907.

1 on the accompanying drawings.

ALBnnT 'rnoms HUGHES, OF LONDON, ENGLAND.

menus son Looms ms TO some.

. Specification. of Letters Patent.

Patented July 9, 1907. a

V Application filed April 1, 1907. Serial No- 366,761.

'which the following is aspecification,

. This invention relates to that class of means for lock lug nuts to bolts-wherein a pin is driven through a hole made across the nut, and during the driving, cuts away a portion of the screw thread of the boltto prevent the nut from turning, due to vibration, the pin in some cases being held secure against falling out by a burring .of the nut against a reduced end.

The object of-my present invention'is to construct means for lockingnuts to bolts whereby a better security is atiorded for preventingthe pin working loose, due to the vibration of the machinery.

"My invention will be clearly understood from the following description aided bythe examples shown Figure 1. is a part sectional end elevation, and Fig.

I 2. a partsectional side elevation of the nut A and part of a bolt B, the nut .being provided with a screw threaded hole 0 across it, and in such a position that a portion of the screw thread of the bolt lies within the hole C of the nut A. Into this screw threaded hole 0 I screw a screw threaded pin-E having one, two' or more grooves F, to allow it to act as a screw tapping tool, so that as the screw pin Ev is worked along the screw threadof the hole 0, it cuts its way through the thread-of the bolt, and forms'a screw thread on-the screw thread of the bolt at that part and at right angles to the proper screw thread of the bolt, the grip bein suiiicient to hold the pin E firmly in place; 1 Fig. 3; is a part sectional end elevationof a bolt and nut in which thehole 0 is plain, the-screw threaded pin E cutting into the screw thread of the bolt B as at Figs. 1 and 2; Inthis case, the grip is practically only at the bolt portion, and to further prevent any movement of the pin E, the portion G of the nut may be hammered or burred down over the collar H of the pin E, the burring closing on the portion I of the pin'by which'itiis screwed into the hole 0. Fig. 4. is a similar view to Fig. 3 except that. the col lar H' is of larger diameter than the pin E andfits .in a recess- J of the nut, the portion G when burned down effectually preventing any movement of thenut A.

The pinC is extracted by anunscrewing action,

- which opens out theburredover portions and allows- 1. In a nut and bolt lock, a bolt having a threadedstem, a nut having an opening provided with screw threads for engagement with the threads of the bolt,

recesses forming burs to produce a' cutting point on the 7 pin to initially cut the thread of the bolt.

2. In aunt and bolt lock, a bolt having :1 threaded stem, a perforated nut having internal threads'for engagement with the threads of the bolt, said nut having ancut the threads of the bolt, and a shoulder near the opposite end of said pin forming u-stop therefor.

In testimnoy whereof I have hereunto set'my hand in presence 01' two subscribing witnesses.

= .ALBnn'r THOMAS nnenns, .Witnesses:

WM. 0." BROWN, Hnon Huemzs. 

